I have a Bad Boy mower with a 26 hp Briggs v twin that developed a rather sudden oil leak when I went to use it a couple of weeks ago. It initially looked like it was leaking below the manifold or slightly left of it, but after little cleaning it looked like it was coming from somewhere on the right side, coming down somewhere below the right head. It only leaks when running and while warm after running. I think oil is getting into exhaust also because it smokes and smells like burned oil when it starts to leak. I've replaced both head gaskets and valve cover gaskets and it still leaks. I've pulled the breather off -- I can't tell whether it's shot or not. I cleaned the tube and put a paper towel over it and sucked and blew into it. It seemed like it was only allowing flow in the one direction but, again, I can't really tell . The gasket for the breather was shot and was in pieces when I pulled it, if that makes any difference. I haven't yet put that back on because I need another gasket and I guess I'll go ahead and get a new breather. Before I resorted to pulling the breather I watched it run with as many shrouds and ancillaries pulled and I see drips below the right head, landing just to the left of the oil sender switch. I still can't see where it's leaking but it almost seems like the drips are coming an inch or two behind the head gasket area. What else is there to leak in that area? I replaced that head gasket, but I did not machine/mill/true the head. Could the head be warped? Could the block be warped? Any ideas appreciated. Thanks,
Grant
Grant